Agent ~ how to use a hotspot to link asp

hi,
Can i know how to link a hotspot to asp file? i'm using frame. i have leftframe and mainframe.
the left frame is fixed. when i click on the hot spot on the left frame pic, i wan it to link to register.asp but target on the main frame but it will have a dialog box prompt

File downloading
u are downloading from
register.asp from C://.........

do u want to
open save cancel info

Does your webserver allow ASP ? and make sure the link points to that page and not a file on your C Drive